/* Blink Turns on an LED on for two second, then off for two second, repeatedly. This example code is in the public domain. */ void setup () { // Initialize the digital pin as an output. // Pin 13 has an LED connected on most Arduino boards: pinMode (13, OUTPUT); } void loop () { digitalWrite (13, HIGH); // set the LED on delay (2000); // wait for a second digitalWrite (13, LOW); // set the LED off delay (2000); // wait for a second }